Seriously running out of ideas on things to check re:bad holeshot

**90 5.0** · 06-11-2018, 01:30 PM

All right , here is the deal.

My 225 promax that normally screams out of the hole has developed a slow get up issue.

It is a 15” offshore 225 promax ss just Incase you were wondering what mid, it that it matters in this case.

Boat didn’t get used much for a while, due to more priorities with life etc.

took boat out, idled bad and would not get on plane at all.

Had fresh gas, believed to be stator issue. Had 16amp electronics on it.

Put all 40 amp electrics back on it, was fine. Sat for a good while again.

Fresh gas, slow holeshot. Bogged like it was loaded up and slowly built rpm. As soon as it hit 3k rpm it comes on like crazy.

Checked the normals, timing , compression , stator , etc. all seem good.

Tried getting up on plane , letting it clear out and setting it back down and immediately trying again.
Better, but not perfect. Ok, it’s loading up on fuel, injectors are need of service.

Yank injectors and swap in another known good set.

Much much better, but still not like it should be, still gets up going slower than normal , and hits 3k rpm and comes on like crazy.

Very responsive and snappy after 3k rpm anytime you punch it or roll into it all the way to the limiter.

As soon as I load the video of the hole shot I’ll post it here.

I’m scratching my head on things to check next.

Replaced flywheel, stator and switch boxes
checked timing etc
replaced injectors.

Would map sensor going out on ecu cause this?

**bullet123** · 06-11-2018, 01:50 PM

VST ? Pulse pump?

**bullet123** · 06-11-2018, 01:52 PM

Serial Number?

**DOC W** · 06-11-2018, 01:52 PM

check reeds

**DOC W** · 06-11-2018, 01:53 PM

also check for moisture in map tub and the fitting is clear

**90 5.0** · 06-11-2018, 01:59 PM

Originally Posted by bullet123

VST ? Pulse pump?

I thought of that , but figured if it was fuel delivery issue high rpm would be effected not out the gate?

i have another vet that’s been sitting around but was good when it came off the motor it was on.

I should probably go through it and put it on just for kicks

**90 5.0** · 06-11-2018, 02:00 PM

Originally Posted by DOC W

also check for moisture in map tub and the fitting is clear

i checked the fitting but I’ll check it again. Was thinking it might possibly be map vaccumm related

**DOC W** · 06-11-2018, 02:51 PM

also why i say reeds if they are not sealing they will make it run pig rich and not idle

**DOC W** · 06-11-2018, 02:52 PM

good luck on it and keep us posted

**90 5.0** · 06-11-2018, 02:54 PM

Originally Posted by DOC W

also why i say reeds if they are not sealing they will make it run pig rich and not idle

I looked at the reeds when I had the plenum out to swap injectors.

Looked normal from a quick glance, and idles absolutely perfect

starts in gear fine idles all day long, punch it and it is slow to build rpm until 3k, then it’s like a switch is flipped and it’s fine.

**DOC W** · 06-11-2018, 02:59 PM

oh ok i just saw you said idled bad didnt know that was gone sorry. could try a 200 box on it just for a holeshot and see what it does also .

**90 5.0** · 06-11-2018, 03:09 PM

Originally Posted by DOC W

oh ok i just saw you said idled bad didnt know that was gone sorry. could try a 200 box on it just for a holeshot and see what it does also .

I might have not been clear enough on my write up, it was idling bad and wouldn’t get out of the hole at all.

I had a bad 16amp stator, I put 40 amp back on it and it was fine , then the boat sat up for a while and it’s doingthis now.

Was very hard to get on plane but idled fine, swapped injectors. Gets on plane better but not like it should, so there were two problems

injectors being one and there is something else I’m not finding.

I have my race ecu I can put on, if it holshots fine then I guess that will tell me it’s a bad map sensor

**DOC W** · 06-11-2018, 03:18 PM

yes sir or put vacuum pump on map hose and start pulling vaccum and see if idle changes that will tell you also ive done that to eliminate motor not pulling vaccumm causing the problem . definatly keep us posted good luck

.

**whipper** · 06-11-2018, 04:17 PM

Deffinetly sounds like ecu since you did all the normal checks. BTW the pulse pump going generally hole shots fine but runs out of gas as you increase the demand as it cant keep up is thats tell tail. its worth chaning the diaphrams anyway while your at it for 20 bucks every year or two. Mine did what your is some time ago now and was the ecu. I switched to Tonys acu and never had a hickup since. Another thing to try is swapping over your rectifier wires. Dont ask me why but a race engine builder told me to try that when I called him from the lake with low power and it worked. He didnt have an explination either just was passed down to him also haha. My moneys on betting ecu though. And if memory serves me right i had just changed flywheel and switch boxes also? hmmm Also you never mentioned timming? Maybe that changed some how with flywheel swap? Bad plugges or plug wires? still betting on ecu .. :] If ecu doesnt fix it i would look at those aother things. I know when setting up my TPS before i got the Brucato unit map reading and set up was almosy inpossable. thats what lead to a new acu. Bogging better up top nothing down low ect..

**90 5.0** · 06-11-2018, 04:35 PM

Originally Posted by whipper

Deffinetly sounds like ecu since you did all the normal checks. BTW the pulse pump going generally hole shots fine but runs out of gas as you increase the demand as it cant keep up is thats tell tail. its worth chaning the diaphrams anyway while your at it for 20 bucks every year or two. Mine did what your is some time ago now and was the ecu. I switched to Tonys acu and never had a hickup since. Another thing to try is swapping over your rectifier wires. Dont ask me why but a race engine builder told me to try that when I called him from the lake with low power and it worked. He didnt have an explination either just was passed down to him also haha. My moneys on betting ecu though. And if memory serves me right i had just changed flywheel and switch boxes also? hmmm Also you never mentioned timming? Maybe that changed some how with flywheel swap? Bad plugges or plug wires? still betting on ecu .. :] If ecu doesnt fix it i would look at those aother things. I know when setting up my TPS before i got the Brucato unit map reading and set up was almosy inpossable. thats what lead to a new acu. Bogging better up top nothing down low ect..

Yeah i I checked the timing. Acu wouldn’t be allowed in some of the tournaments I fish or I would have done that or swapped to an a-6 style box instead of the xri style long ago.